Ranjivosti programske biblioteke glibc

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by ncert - 22. travnja 2015.4. svibnja 2015.0

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Red Hat Security Advisory

Synopsis: Moderate: glibc security and bug fix update
Advisory ID: RHSA-2015:0863-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0863.html
Issue date: 2015-04-21
CVE Names: CVE-2013-7423 CVE-2015-1781
=====================================================================

1. Summary:

Updated glibc packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) – i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) – i386, x86_64

3. Description:

The glibc packages provide the standard C libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the Name
Server Caching Daemon (nscd) used by multiple programs on the system.
Without these libraries, the Linux system cannot function correctly.

A buffer overflow flaw was found in the way glibc’s gethostbyname_r() and
other related functions computed the size of a buffer when passed a
misaligned buffer as input. An attacker able to make an application call
any of these functions with a misaligned buffer could use this flaw to
crash the application or, potentially, execute arbitrary code with the
permissions of the user running the application. (CVE-2015-1781)

It was discovered that, under certain circumstances, glibc’s getaddrinfo()
function would send DNS queries to random file descriptors. An attacker
could potentially use this flaw to send DNS queries to unintended
recipients, resulting in information disclosure or data loss due to the
application encountering corrupted data. (CVE-2013-7423)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

This update also fixes the following bug:

* Previously, the nscd daemon did not properly reload modified data when
the user edited monitored nscd configuration files. As a consequence, nscd
returned stale data to system processes. This update adds a system of
inotify-based monitoring and stat-based backup monitoring for nscd
configuration files. As a result, nscd now detects changes to its
configuration files and reloads the data properly, which prevents it from
returning stale data. (BZ#1194149)

All glibc users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1187109 – CVE-2013-7423 glibc: getaddrinfo() writes DNS queries to random file descriptors under high load
1199525 – CVE-2015-1781 glibc: buffer overflow in gethostbyname_r() and related functions with misaligned buffer

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
glibc-2.12-1.149.el6_6.7.src.rpm

i386:
glibc-2.12-1.149.el6_6.7.i686.rpm
glibc-common-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-devel-2.12-1.149.el6_6.7.i686.rpm
glibc-headers-2.12-1.149.el6_6.7.i686.rpm
glibc-utils-2.12-1.149.el6_6.7.i686.rpm
nscd-2.12-1.149.el6_6.7.i686.rpm

x86_64:
glibc-2.12-1.149.el6_6.7.i686.rpm
glibc-2.12-1.149.el6_6.7.x86_64.rpm
glibc-common-2.12-1.149.el6_6.7.x86_64.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.x86_64.rpm
glibc-devel-2.12-1.149.el6_6.7.i686.rpm
glibc-devel-2.12-1.149.el6_6.7.x86_64.rpm
glibc-headers-2.12-1.149.el6_6.7.x86_64.rpm
glibc-utils-2.12-1.149.el6_6.7.x86_64.rpm
nscd-2.12-1.149.el6_6.7.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-static-2.12-1.149.el6_6.7.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.x86_64.rpm
glibc-static-2.12-1.149.el6_6.7.i686.rpm
glibc-static-2.12-1.149.el6_6.7.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
glibc-2.12-1.149.el6_6.7.src.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Red Hat Enterprise Linux Server (v. 6):

Source:
glibc-2.12-1.149.el6_6.7.src.rpm

ppc64:
glibc-2.12-1.149.el6_6.7.ppc.rpm
glibc-2.12-1.149.el6_6.7.ppc64.rpm
glibc-common-2.12-1.149.el6_6.7.ppc64.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.ppc.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.ppc64.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.ppc.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.ppc64.rpm
glibc-devel-2.12-1.149.el6_6.7.ppc.rpm
glibc-devel-2.12-1.149.el6_6.7.ppc64.rpm
glibc-headers-2.12-1.149.el6_6.7.ppc64.rpm
glibc-utils-2.12-1.149.el6_6.7.ppc64.rpm
nscd-2.12-1.149.el6_6.7.ppc64.rpm

s390x:
glibc-2.12-1.149.el6_6.7.s390.rpm
glibc-2.12-1.149.el6_6.7.s390x.rpm
glibc-common-2.12-1.149.el6_6.7.s390x.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.s390.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.s390x.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.s390.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.s390x.rpm
glibc-devel-2.12-1.149.el6_6.7.s390.rpm
glibc-devel-2.12-1.149.el6_6.7.s390x.rpm
glibc-headers-2.12-1.149.el6_6.7.s390x.rpm
glibc-utils-2.12-1.149.el6_6.7.s390x.rpm
nscd-2.12-1.149.el6_6.7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-static-2.12-1.149.el6_6.7.i686.rpm

ppc64:
glibc-debuginfo-2.12-1.149.el6_6.7.ppc.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.ppc64.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.ppc.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.ppc64.rpm
glibc-static-2.12-1.149.el6_6.7.ppc.rpm
glibc-static-2.12-1.149.el6_6.7.ppc64.rpm

s390x:
glibc-debuginfo-2.12-1.149.el6_6.7.s390.rpm
glibc-debuginfo-2.12-1.149.el6_6.7.s390x.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.s390.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.s390x.rpm
glibc-static-2.12-1.149.el6_6.7.s390.rpm
glibc-static-2.12-1.149.el6_6.7.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
glibc-2.12-1.149.el6_6.7.src.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.149.el6_6.7.i686.rpm
glibc-debuginfo-common-2.12-1.149.el6_6.7.i686.rpm
glibc-static-2.12-1.149.el6_6.7.i686.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2013-7423
https://access.redhat.com/security/cve/CVE-2015-1781
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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